English verb conjugation
MUST TREMBLE

Regular verb: tremble - trembled - trembled

Affirmation

Simple form	V-ing form
I must tremble you must tremble he must tremble we must tremble you must tremble they must tremble	I must be trembling you must be trembling he must be trembling we must be trembling you must be trembling they must be trembling
Perfect	V-ing perfect
I must have trembled you must have trembled he must have trembled we must have trembled you must have trembled they must have trembled	I must have been trembling you must have been trembling he must have been trembling we must have been trembling you must have been trembling they must have been trembling

Negation

Simple form	V-ing form
I must not tremble you must not tremble he must not tremble we must not tremble you must not tremble they must not tremble	I must not be trembling you must not be trembling he must not be trembling we must not be trembling you must not be trembling they must not be trembling
Perfect	V-ing perfect
I must not have trembled you must not have trembled he must not have trembled we must not have trembled you must not have trembled they must not have trembled	I must not have been trembling you must not have been trembling he must not have been trembling we must not have been trembling you must not have been trembling they must not have been trembling

Interrogative form

Simple form	V-ing form
must I tremble? must you tremble? must he tremble? must we tremble? must you tremble? must they tremble?	must I be trembling? must you be trembling? must he be trembling? must we be trembling? must you be trembling? must they be trembling?
Perfect	V-ing perfect
must I have trembled? must you have trembled? must he have trembled? must we have trembled? must you have trembled? must they have trembled?	must I have been trembling? must you have been trembling? must he have been trembling? must we have been trembling? must you have been trembling? must they have been trembling?

Interro-negative form

Simple form	V-ing form
must I not tremble? must you not tremble? must he not tremble? must we not tremble? must you not tremble? must they not tremble?	must I not be trembling? must you not be trembling? must he not be trembling? must we not be trembling? must you not be trembling? must they not be trembling?
Perfect	V-ing perfect
must I not have trembled? must you not have trembled? must he not have trembled? must we not have trembled? must you not have trembled? must they not have trembled?	must I not have been trembling? must you not have been trembling? must he not have been trembling? must we not have been trembling? must you not have been trembling? must they not have been trembling?